echo_ezkit_isr.asm

ADI-219x dsp的回声消除代码

/************************************************************************************************
* TITLE: 	Echo_EZKIT_ISR
* PURPOSE:	Echo Cancellation ISR for the ADSP-2191 EZ-KIT	
* 
*
* Modified: 07/12/2001 - GJO
*
************************************************************************************************/
#include <def2191.h>

/************************************************************************************************/
/*			   EXTERNAL DECLARATIONS															*/	
/************************************************************************************************/
.EXTERN Start;
.EXTERN	Process_AD1885_Audio_Samples;
.EXTERN RX_Status;
.EXTERN move_disp;
.EXTERN rx_buf;

/************************************************************************************************/
/* 				PM Reset interrupt vector code 													*/
/************************************************************************************************/
.section/pm IVreset; 
  	jump Start;
  	nop; nop; nop;

/************************************************************************************************/
/* 				SPORT0 RX ISR																	*/
/************************************************************************************************/
.section/pm IVint4;  
	ENA SR;									/* Enable Secondary Registers */
	ay1 = IOPG;
  	IOPG = SPORT0_Controller_Page;

	ax0 = LENGTH(rx_buf);					/* Determine if Interrupt occured at the middle of */
	ay0 = IO(SP0DR_CNT);					/* the DMA Buffer or at the end of DMA Buffer */
	ar = ax0 - ay0;
	if eq jump Roll_Over;
	
	ay0 = 0x8000;
	ax0 = dm(RX_Status);					/* Get status bit 15 from RX_Status */
	ar =ax0 AND ay0;
	if eq jump Process_AD1885_Audio_Samples;

/* ...house keeping prior to RTI */
Roll_Over:	
	ar=3;									/* Clear RX Interrupts */
  	io(SP0DR_IRQ)=ar;
	
	IOPG = ay1;
	DIS SR;									/* Disable Secondary Registers */
	RTI; 									
	
/************************************************************************************************/
/* 				Push Button ISR	- Beta change													*/
/************************************************************************************************/
.section/pm IVint6; 
jump move_disp;